Stash temporary changes. Does not build; is not intended to.

37 files changed, 1135 insertions, 2 deletions

diff --git a/NEWS b/NEWS
index 16673dc..b505c52 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,13 @@
 Changelog for s6-rc.
 
+In 1.0.0.0
+----------
+
+ - New model: s6-rc is now event-based.
+ - New service types: virtuals and externals.
+ - New program: s6-rcd.
+
+
 In 0.5.2.0
 ----------
 
diff --git a/doc/index.html b/doc/index.html
index 08cad57..1217a1c 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -67,7 +67,7 @@ requirement if you link against the shared version of the skalibs library. </li>
 
 <ul>
  <li> The current released version of s6-rc is
-<a href="s6-rc-0.5.2.0.tar.gz">0.5.2.0</a>. </li>
+<a href="s6-rc-1.0.0.0.tar.gz">1.0.0.0</a>. </li>
  <li> Alternatively, you can checkout a copy of the
 <a href="//git.skarnet.org/cgi-bin/cgit.cgi/s6-rc/">s6-rc
 git repository</a>:
diff --git a/doc/upgrade.html b/doc/upgrade.html
index 9312335..c51f0c7 100644
--- a/doc/upgrade.html
+++ b/doc/upgrade.html
@@ -30,6 +30,11 @@ minor and bugfix version changes.
 
 <h1> What has changed in s6-rc </h1>
 
+<h2> in 1.0.0.0 </h2>
+
+<ul>
+</ul>
+
 <h2> in 0.5.2.0 </h2>
 
 <ul>
diff --git a/package/info b/package/info
index dadf0dd..6249dfe 100644
--- a/package/info
+++ b/package/info
@@ -1,4 +1,4 @@
 package=s6-rc
-version=0.5.2.0
+version=1.0.0.0
 category=admin
 package_macro_name=S6RC
diff --git a/src/include/s6-rc/connection-common.h b/src/include/s6-rc/connection-common.h
new file mode 100644
index 0000000..b78d459
--- /dev/null
+++ b/src/include/s6-rc/connection-common.h
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#ifndef S6RC_CONNECTION_COMMON_H
+#define S6RC_CONNECTION_COMMON_H
+
+#include <skalibs/textmessage.h>
+
+#define S6RC_CONNECTION_BUFSIZE 4096
+
+typedef struct s6rc_connection_s s6rc_connection_t, *s6rc_connection_t_ref ;
+struct s6rc_connection_s
+{
+  textmessage_sender_t out ;
+  textmessage_receiver_t in ;
+  char inbuf[S6RC_CONNECTION_BUFSIZE] ;
+} ;
+#define S6RC_CONNECTION_ZERO { .out = TEXTMESSAGE_SENDER_ZERO, .in = TEXTMESSAGE_RECEIVER_ZERO, .inbuf = "" }
+
+#define S6RC_MONITOR_BANNER "s6-rc monitor: after\n"
+#define S6RC_MONITOR_BANNERLEN (sizeof(S6RC_MONITOR_BANNER) - 1)
+
+#endif
diff --git a/src/include/s6-rc/connection.h b/src/include/s6-rc/connection.h
new file mode 100644
index 0000000..f6d5eda
--- /dev/null
+++ b/src/include/s6-rc/connection.h
@@ -0,0 +1,16 @@
+/* ISC license. */
+
+#ifndef S6_RC_CONNECTION_H
+#define S6_RC_CONNECTION_H
+
+#include <skalibs/tai.h>
+#include <skalibs/textmessage.h>
+
+#include <s6-rc/connection-common.h>
+
+extern int s6rc_connection_start (s6rc_connection_t *, char const *, tain_t const *, tain_t *) ;
+#define s6rc_connection_start_g(path, deadline) s6rc_connection_start(path, (deadline), &STAMP)
+
+extern void s6rc_connection_end (s6rc_connection_t *) ;
+
+#endif
diff --git a/src/include/s6-rc/db.h b/src/include/s6-rc/db.h
new file mode 100644
index 0000000..0f03967
--- /dev/null
+++ b/src/include/s6-rc/db.h
@@ -0,0 +1,76 @@
+/* ISC license. */
+
+#ifndef S6RC_DB_H
+#define S6RC_DB_H
+
+#include <stdint.h>
+#include <skalibs/diuint32.h>
+#include <skalibs/buffer.h>
+
+#define S6RC_DB_BANNER_START "s6rc-db: start\n"
+#define S6RC_DB_BANNER_START_LEN (sizeof(S6RC_DB_BANNER_START) - 1)
+#define S6RC_DB_BANNER_END "\ns6rc-db: end\n"
+#define S6RC_DB_BANNER_END_LEN (sizeof(S6RC_DB_BANNER_END) - 1)
+
+#define S6RC_DB_FLAG_ESSENTIAL 0x00000001U
+
+
+typedef struct s6rc_oneshot_s s6rc_oneshot_t, *s6rc_oneshot_t_ref ;
+struct s6rc_oneshot_s
+{
+  uint32_t argc[2] ;
+  uint32_t argv[2] ;
+} ;
+
+typedef struct s6rc_longrun_s s6rc_longrun_t, *s6rc_longrun_t_ref ;
+struct s6rc_longrun_s
+{
+  uint32_t consumer ;
+  uint32_t nproducers ;
+  uint32_t producers ;
+} ;
+
+typedef union s6rc_longshot_u s6rc_longshot_t, *s6rc_longshot_t_ref ;
+union s6rc_longshot_u
+{
+  s6rc_oneshot_t oneshot ;
+  s6rc_longrun_t longrun ;
+} ;
+
+typedef struct s6rc_service_s s6rc_service_t, *s6rc_service_t_ref ;
+struct s6rc_service_s
+{
+  uint32_t name ;
+  uint32_t flags ;
+  uint32_t deps[2] ;
+  uint32_t ndeps[2] ;
+  uint32_t timeout[2] ;
+  s6rc_longshot_t x ;
+} ;
+
+typedef struct s6rc_db_s s6rc_db_t, *s6rc_db_t_ref ;
+struct s6rc_db_s
+{
+  s6rc_service_t *services ;
+  unsigned int nshort ;
+  unsigned int nlong ;
+  unsigned int stringlen ;
+  unsigned int nargvs ;
+  unsigned int ndeps ;
+  unsigned int nproducers ;
+  char *string ;
+  char const **argvs ;
+  uint32_t *deps ;
+  uint32_t *producers ;
+} ;
+
+extern int s6rc_db_read_uint32 (buffer *, uint32_t *) ;
+
+extern int s6rc_db_read_sizes (int, s6rc_db_t *) ;
+extern int s6rc_db_read (int, s6rc_db_t *) ;
+
+extern int s6rc_db_check_pipelines (s6rc_db_t const *, diuint32 *) ;
+extern int s6rc_db_check_depcycles (s6rc_db_t const *, int, diuint32 *) ;
+extern int s6rc_db_check_revdeps (s6rc_db_t const *) ;
+
+#endif
diff --git a/src/libs6rc/s6rc_connection_end.c b/src/libs6rc/s6rc_connection_end.c
new file mode 100644
index 0000000..e993881
--- /dev/null
+++ b/src/libs6rc/s6rc_connection_end.c
@@ -0,0 +1,14 @@
+/* ISC license. */
+
+#include <skalibs/djbunix.h>
+#include <skalibs/textmessage.h>
+
+#include <s6-rc/connection-common.h>
+#include <s6-rc/connection.h>
+
+void s6rc_connection_end (s6rc_connection_t *a)
+{
+  fd_close(textmessage_sender_fd(&a->out)) ;
+  textmessage_sender_free(&a->out) ;
+  textmessage_receiver_free(&a->in) ;
+}
diff --git a/src/libs6rc/s6rc_connection_start.c b/src/libs6rc/s6rc_connection_start.c
new file mode 100644
index 0000000..33b2b1a
--- /dev/null
+++ b/src/libs6rc/s6rc_connection_start.c
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#include <skalibs/djbunix.h>
+#include <skalibs/webipc.h>
+#include <skalibs/textmessage.h>
+
+#include <s6-rc/connection-common.h>
+#include <s6-rc/connection.h>
+
+int s6rc_connection_start (s6rc_connection_t *a, char const *path, tain_t const *deadline, tain_t *stamp)
+{
+  int fd = ipc_stream_nbcoe() ;
+  if (fd < 0) return 0 ;
+  if (!ipc_timed_connect(fd, path, deadline, stamp))
+  {
+    fd_close(fd) ;
+    return 0 ;
+  }
+  textmessage_sender_init(&a->out, fd) ;
+  textmessage_receiver_init(&a->in, fd, a->inbuf, S6RC_CONNECTION_BUFSIZE, TEXTMESSAGE_MAXLEN) ;
+  return 1 ;
+}
diff --git a/src/libs6rc/s6rc_monitor.c b/src/libs6rc/s6rc_monitor.c
new file mode 100644
index 0000000..bd27e8b
--- /dev/null
+++ b/src/libs6rc/s6rc_monitor.c
@@ -0,0 +1,15 @@
+/* ISC license. */
+
+#include <skalibs/djbunix.h>
+#include <skalibs/webipc.h>
+#include <skalibs/textmessage.h>
+
+#include <s6-rc/connection-common.h>
+#include <s6-rc/connection.h>
+
+int s6rc_monitor (s6rc_connection_t *a, textmessage_receiver_t *asyncin, char *asyncbuf, size_t asyncbufsize, tain_t const *deadline, tain_t *stamp)
+{
+  if (!textmessage_timed_send(&a->out, "M", 1, deadline, stamp)) return 0 ;
+  if (!textmessage_recv_channel(textmessage_receiver_fd(&a->in), asyncin, asyncbuf, asyncbufsize, S6RC_MONITOR_BANNER, S6RC_MONITOR_BANNERLEN, deadline, stamp)) return 0 ;
+  return 1 ;
+}
diff --git a/src/libs6rcd/s6rcd.h b/src/libs6rcd/s6rcd.h
new file mode 100644
index 0000000..a9326b7
--- /dev/null
+++ b/src/libs6rcd/s6rcd.h
@@ -0,0 +1,9 @@
+/* ISC license. */
+
+#include <s6-rc/db.h>
+
+extern int s6rcd_livedir_init (char const *, char const *, char const *, char const *, int *)
+extern int s6rcd_livesubdir_create (char *, char const *, char const *) ;
+
+extern int s6rcd_db_load (s6rc_db_t *, char const *) ;
+extern int s6rcd_db_read_sizes (s6rc_db_sizes_t *, char const *) ;
diff --git a/src/libs6rcd/s6rcd_db_load.c b/src/libs6rcd/s6rcd_db_load.c
new file mode 100644
index 0000000..68aa11e
--- /dev/null
+++ b/src/libs6rcd/s6rcd_db_load.c
@@ -0,0 +1,17 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#include <s6-rc/db.h>
+#include "s6rcd.h"
+
+int s6rcd_db_load (s6rc_db_t *db, char const *compiled)
+{
+  if (!s6rcd_db_read_sizes(db, compiled)) return 0 ;
+  
+}
diff --git a/src/libs6rcd/s6rcd_livedir_init.c b/src/libs6rcd/s6rcd_livedir_init.c
new file mode 100644
index 0000000..f252dba
--- /dev/null
+++ b/src/libs6rcd/s6rcd_livedir_init.c
@@ -0,0 +1,124 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/webipc.h>
+
+#include "s6rcd.h"
+
+#ifdef NAME_MAX
+# define S6RC_NAME_MAX NAME_MAX
+#else
+# define S6RC_NAME_MAX 63
+#endif
+
+static inline int mksubdirs (char *s)
+{
+  size_t n = strlen(s) ;
+  size_t i = 0 ;
+  for (; i < n ; i++)
+  {
+    if (s[i] == '/')
+    {
+      int r ;
+      s[i] = 0 ;
+      r = mkdir(s, 0755) ;
+      s[i] = '/' ;
+      if (r < 0 && errno != EEXIST) break ;
+    }
+  }
+  return i >= n ;
+}
+
+int s6rcd_livedir_init (char const *livedir, char const *scandir, char const *prefix, char const *compiled, int *sock)
+{
+  size_t plen = strlen(prefix) ;
+  size_t llen = strlen(livedir) ;
+  struct stat st ;
+  char ltmp[llen + 9] ;
+  if (plen >= S6RC_NAME_MAX)
+    strerr_dief1x(100, "prefix is too long") ;
+
+  memcpy(ltmp, livedir, llen + 1) ;
+  if (!mksubdirs(ltmp, len))
+    strerr_diefu2sys(111, "create subdirectories of ", s) ;
+  if (mkdir(ltmp, 0755) < 0 && errno != EEXIST)
+    strerr_diefu2sys(111, "mkdir ", ltmp) ;
+
+  memcpy(ltmp + llen, "/s", 3) ;
+  *sock = ipc_stream() ;
+  if (*sock < 0)
+    strerr_diefu1sys(111, "create socket") ;
+  if (ipc_bind_reuse(*sock, ltmp) < 0)
+    strerr_diefu2sys(111, "bind to ", ltmp) ;
+
+  memcpy(ltmp + llen + 1, "scandir", 8) ;
+  if (lstat(ltmp, &st) < 0)
+  {
+    if (errno != ENOENT)
+      strerr_diefu2sys(111, "lstat ", ltmp) ;
+    if (symlink(scandir, ltmp) < 0)
+      strerr_diefu4sys(111, "symlink ", ltmp, " to ", scandir) ;
+  }
+  else
+  {
+    size_t slen = strlen(scandir) ;
+    char stmp[slen + 1] ;
+    if (!S_ISLNK(st.st_mode))
+      strerr_dief3x(100, "file ", ltmp, " exists and is not a symbolic link") ;
+    if (readlink(ltmp, stmp, slen + 1) < 0)
+      strerr_diefu2sys(111, "readlink ", ltmp) ;
+    if (strncmp(scandir, stmp, slen + 1))
+      strerr_dief4x(100, "provided scandir ", scandir, " does not match the contents of existing ", ltmp) ;
+  }
+
+  memcpy(ltmp + llen + 1, "prefix", 7) ;
+  if (stat(ltmp, &st) < 0)
+  {
+    if (errno != ENOENT)
+      strerr_diefu2sys(111, "stat ", ltmp) ;
+    if (!openwritenclose_unsafe(ltmp, prefix, strlen(prefix)))
+      strerr_diefu2sys(111, "write prefix to ", ltmp) ;
+  }
+  else
+  {
+    if (!S_IFREG(st.st_mode))
+      strerr_dief3x(100, "file ", ltmp, " exists and is not a regular file") ;
+    if (st.st_size != plen)
+      strerr_dief4x(100, "provided prefix ", prefix, " does not match the contents of existing ", ltmp) ;
+    {
+      char stmp[plen] ;
+      ssize_t r = openreadnclose(ltmp, ptmp, plen) ;
+      if (r != plen)
+        strerr_diefu2sys(111, "read ", ltmp) ;
+      if (memcmp(ptmp, prefix, plen))
+      strerr_dief4x(100, "provided prefix ", prefix, " does not match the contents of existing ", ltmp) ;
+    }
+  }
+
+  memcpy(ltmp + llen + 1, "live", 5) ;
+  if (lstat(ltmp, &st) < 0)
+  {
+    char name[12] ;
+    if (errno != ENOENT) strerr_diefu2sys(111, "lstat ", ltmp) ;
+    if (!s6rcd_livesubdir_create(name, live, compiled))
+      strerr_diefu2sys(111, "create live subdirectory in ", live) ;
+    if (symlink(name, ltmp) < 0)
+      strerr_diefu4sys(111, "symlink ", ltmp, " to ", name) ;
+    return 0 ;
+  }
+  if (!S_ISLNK(st.st_mode))
+    strerr_dief3x(100, "livesubdir ", ltmp, " exists and is not a symbolic link") ;
+  if (stat(ltmp, &st) < 0)
+    strerr_diefu2sys(111, "stat ", ltmp) ;
+  if (!S_ISDIR(st.st_mode))
+    strerr_dief4x(100, "livesubdir ", ltmp, " exists and is not a symbolic link", " to a directory") ;
+  return 1 ;
+}
diff --git a/src/libs6rcd/s6rcd_livesubdir_create.c b/src/libs6rcd/s6rcd_livesubdir_create.c
new file mode 100644
index 0000000..ff989aa
--- /dev/null
+++ b/src/libs6rcd/s6rcd_livesubdir_create.c
@@ -0,0 +1,35 @@
+/* ISC license. */
+
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#include <skalibs/djbunix.h>
+
+#include "s6rcd.h"
+
+int s6rcd_livesubdir_create (char *name, char const *live, char const *compiled)
+{
+  size_t llen = strlen(live) ;
+  size_t clen = strlen(compiled) ;
+  char cfn[clen + 13] ;
+  char lfn[llen + 25] ;
+  memcpy(lfn, live, llen) ;
+  memcpy(lfn + llen, "/live:XXXXXX", 13) ;
+  if (!mkdtemp(lfn)) return 0 ;
+
+  memcpy(lfn + llen + 12, "/compiled", 10) ;
+  if (symlink(compiled, lfn) < 0) return 0 ;
+    strerr_diefu4sys(111, "symlink ", compiled, " to ", realfn + llen + 1) ;
+
+  memcpy(cfn, compiled, clen) ;
+  memcpy(cfn + clen, "/servicedirs", 13) ;
+  memcpy(lfn + llen + 13, "servicedirs", 12) ;
+  if (!hiercopy(cfn, lfn)) return 0 ;
+
+  lfn[llen + 12] = 0 ;
+  if (chmod(lfn, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) return 0 ;
+  memcpy(name, lfn + llen + 1, 12) ;
+  return 1 ;
+}
diff --git a/src/s6-rc/s6-rcd.c b/src/s6-rc/s6-rcd.c
new file mode 100644
index 0000000..7c7b586
--- /dev/null
+++ b/src/s6-rc/s6-rcd.c
@@ -0,0 +1,770 @@
+/* ISC license. */
+
+#include <sys/uio.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+#include <regex.h>
+
+#include <skalibs/posixplz.h>
+#include <skalibs/posixishard.h>
+#include <skalibs/types.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/env.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/error.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/tai.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/sig.h>
+#include <skalibs/iopause.h>
+#include <skalibs/selfpipe.h>
+#include <skalibs/cdb.h>
+#include <skalibs/getpeereid.h>
+#include <skalibs/webipc.h>
+
+#include <s6/accessrules.h>
+
+#define USAGE "s6-rcd [ -v verbosity ] [ -1 ] [ -C maxconn ] [ -T lameducktimeout ] [ -i rulesdir | -x rulesfile ] [ -c compiled ] [ -l livedir ]"
+#define dieusage() strerr_dieusage(100, USAGE) ;
+
+#define S6RC_MAXCONN 64
+
+static unsigned int verbosity = 1 ;
+static int cont = 1 ;
+static tain_t answertto = TAIN_INFINITE_RELATIVE ;
+static tain_t lameduckdeadline = TAIN_INFINITE_RELATIVE ;
+static tain_t const nano1 = { .sec = TAI_ZERO, .nano = 1 } ;
+
+static char const *scandir = S6RC_SCANDIR_DEFAULT ;
+static char const *livedir = S6RC_LIVEDIR_DEFAULT ;
+
+static unsigned int rulestype = 0 ;
+static char const *rules = 0 ;
+static int cdbfd = -1 ;
+static struct cdb cdbmap = CDB_ZERO ;
+
+static void handle_signals (void)
+{
+  for (;;) switch (selfpipe_read())
+  {
+    case -1 : strerr_diefu1sys(111, "selfpipe_read()") ;
+    case 0 : return ;
+    case SIGTERM :
+    {
+      if (cont)
+      {
+        cont = 0 ;
+        tain_add_g(&lameduckdeadline, &lameduckdeadline) ;
+      }
+      break ;
+    }
+    case SIGHUP :
+    {
+      int fd ;
+      struct cdb c = CDB_ZERO ;
+      if (rulestype != 2) break ;
+      fd = openc_readb(rules) ;
+      if (fd < 0) break ;
+      if (cdb_init(&c, fd) < 0)
+      {
+        fd_close(fd) ;
+        break ;
+      }
+      cdb_free(&cdbmap) ;
+      fd_close(cdbfd) ;
+      cdbfd = fd ;
+      cdbmap = c ;
+      break ;
+    }
+    default : break ;
+  }
+}
+
+
+ /* client connection */
+
+typedef struct client_s client_t, *client_t_ref ;
+struct client_s
+{
+  uint32_t next ;
+  uint32_t xindex ;
+  tain_t deadline ;
+  regex_t rre ;
+  regex_t wre ;
+  unixconnection_t connection ;
+} ;
+
+static genset *clients ;
+static uint32_t sentinel ;
+#define CLIENT(i) genset_p(client_t, clients, (i))
+#define numconn (genset_n(clients) - 1)
+
+static inline void client_free (client_t *c)
+{
+  fd_close(unixmessage_sender_fd(&c->connection.out)) ;
+  unixconnection_free(&c->connection) ;
+  regfree(&c->rre) ;
+  regfree(&c->wre) ;
+}
+
+static inline void client_delete (uint32_t cc, uint32_t prev)
+{
+  client_t *c = CLIENT(cc) ;
+  CLIENT(prev)->next = c->next ;
+  client_free(c) ;
+  genset_delete(clients, cc) ;
+}
+
+static void removeclient (uint32_t *i, uint32_t j)
+{
+  client_delete(*i, j) ;
+  *i = j ;
+}
+
+static void client_setdeadline (client_t *c)
+{
+  tain_t blah ;
+  tain_half(&blah, &tain_infinite_relative) ;
+  tain_add_g(&blah, &blah) ;
+  if (tain_less(&blah, &c->deadline))
+    tain_add_g(&c->deadline, &answertto) ;
+}
+
+static inline int client_prepare_iopause (uint32_t i, tain_t *deadline, iopause_fd *x, uint32_t *j)
+{
+  client_t *c = CLIENT(i) ;
+  if (tain_less(&c->deadline, deadline)) *deadline = c->deadline ;
+  if (!unixmessage_sender_isempty(&c->connection.out) || !unixmessage_receiver_isempty(&c->connection.in) || (cont && !unixmessage_receiver_isfull(&c->connection.in)))
+  {
+    x[*j].fd = unixmessage_sender_fd(&c->connection.out) ;
+    x[*j].events = (!unixmessage_receiver_isempty(&c->connection.in) || (cont && !unixmessage_receiver_isfull(&c->connection.in)) ? IOPAUSE_READ : 0) | (!unixmessage_sender_isempty(&c->connection.out) ? IOPAUSE_WRITE : 0) ;
+    c->xindex = (*j)++ ;
+  }
+  else c->xindex = 0 ;
+  return !!c->xindex ;
+}
+
+static inline void client_add (uint32_t *cc, int fd, regex_t const *rre, regex_t const *wre, unsigned int flags)
+{
+  uint32_t i ;
+  client_t *c ;
+  i = genset_new(clients) ;
+  c = CLIENT(i) ;
+  tain_add_g(&c->deadline, &answertto) ;
+  c->rre = *rre ;
+  c->wre = *wre ;
+  c->dumping = 0 ;
+  c->flags = flags ;
+  unixconnection_init(&c->connection, fd, fd) ;
+  c->next = CLIENT(sentinel)->next ;
+  CLIENT(sentinel)->next = i ;
+  *cc = i ;
+}
+
+static inline int client_flush (uint32_t i, iopause_fd const *x)
+{
+  client_t *c = CLIENT(i) ;
+  if (c->xindex && (x[c->xindex].revents & IOPAUSE_WRITE))
+  {
+    if (unixconnection_flush(&c->connection))
+      tain_add_g(&c->deadline, &tain_infinite_relative) ;
+    else if (!error_isagain(errno)) return 0 ;
+  }
+  return 1 ;
+}
+
+static int answer (client_t *c, char e)
+{
+  unixmessage_t m = { .s = &e, .len = 1, .fds = 0, .nfds = 0 } ;
+  if (!unixmessage_put(&c->connection.out, &m)) return 0 ;
+  client_setdeadline(c) ;
+  return 1 ;
+}
+
+static int do_store (uint32_t cc, unixmessage_t const *m)
+{
+  uint32_t pp, idlen ;
+  client_t *c = CLIENT(cc) ;
+  s6_fdholder_fd_t *p ;
+  if (c->dumping || m->len < TAIN_PACK + 3 || m->nfds != 1) return (errno = EPROTO, 0) ;
+  idlen = (unsigned char)m->s[TAIN_PACK] ;
+  if (idlen > S6_FDHOLDER_ID_SIZE || idlen + 2 + TAIN_PACK != m->len || m->s[1 + TAIN_PACK + idlen]) return (errno = EPROTO, 0) ;
+  if (regexec(&c->wre, m->s + TAIN_PACK + 1, 0, 0, 0))
+  {
+    unixmessage_drop(m) ;
+    return answer(c, EPERM) ;
+  }
+  if (numfds >= maxfds)
+  {
+    unixmessage_drop(m) ;
+    return answer(c, ENFILE) ;
+  }
+  if (avltreen_search(fds_by_id, m->s + TAIN_PACK + 1, &pp))
+  {
+    unixmessage_drop(m) ;
+    return answer(c, EBUSY) ;
+  }
+  if (!answer(c, 0)) return 0 ;
+  pp = genset_new(fdstore) ; p = FD(pp) ;
+  tain_unpack(m->s, &p->limit) ; p->fd = m->fds[0] ;
+  memcpy(p->id, m->s + TAIN_PACK + 1, idlen) ;
+  memset(p->id + idlen, 0, S6_FDHOLDER_ID_SIZE + 1 - idlen) ;
+  for (;;)
+  {
+    uint32_t dummy ;
+    if (!avltreen_search(fds_by_deadline, &p->limit, &dummy)) break ;
+    tain_add(&p->limit, &p->limit, &nano1) ;
+  }
+  avltreen_insert(fds_by_id, pp) ;
+  avltreen_insert(fds_by_deadline, pp) ;
+  return 1 ;
+}
+
+static int do_delete (uint32_t cc, unixmessage_t const *m)
+{
+  uint32_t pp, idlen ;
+  client_t *c = CLIENT(cc) ;
+  if (c->dumping || m->len < 3 || m->nfds) return (errno = EPROTO, 0) ;
+  idlen = (unsigned char)m->s[0] ;
+  if (idlen > S6_FDHOLDER_ID_SIZE || idlen + 2 != m->len || m->s[idlen + 1]) return (errno = EPROTO, 0) ;
+  if (regexec(&c->wre, m->s + 1, 0, 0, 0)) return answer(c, EPERM) ;
+  if (!avltreen_search(fds_by_id, m->s + 1, &pp)) return answer(c, ENOENT) ;
+  if (!answer(c, 0)) return 0 ;
+  fds_close_and_delete(pp) ;
+  return 1 ;
+}
+
+static int do_retrieve (uint32_t cc, unixmessage_t const *m)
+{
+  int fd ;
+  unixmessage_t ans = { .s = "", .len = 1, .fds = &fd, .nfds = 1 } ;
+  uint32_t pp, idlen ;
+  client_t *c = CLIENT(cc) ;
+  if (c->dumping || m->len < 4 || m->nfds) return (errno = EPROTO, 0) ;
+  idlen = (unsigned char)m->s[1] ;
+  if (idlen > S6_FDHOLDER_ID_SIZE || idlen + 3 != m->len || m->s[idlen + 2]) return (errno = EPROTO, 0) ;
+  if (regexec(&c->rre, m->s + 2, 0, 0, 0)) return answer(c, EPERM) ;
+  if (m->s[0] && regexec(&c->wre, m->s + 2, 0, 0, 0)) return answer(c, EPERM) ;
+  if (!avltreen_search(fds_by_id, m->s + 2, &pp)) return answer(c, ENOENT) ;
+  fd = FD(pp)->fd ;
+  if (!unixmessage_put_and_close(&c->connection.out, &ans, m->s[0] ? unixmessage_bits_closeall : unixmessage_bits_closenone)) return 0 ;
+  if (m->s[0]) fds_delete(pp) ;
+  return 1 ;
+}
+
+static int fill_siovec_with_ids_iter (char *thing, void *data)
+{
+  struct iovec *v = (*(struct iovec **)data)++ ;
+  s6_fdholder_fd_t *p = (s6_fdholder_fd_t *)thing ;
+  v->iov_base = p->id ;
+  v->iov_len = strlen(p->id) + 1 ;
+  return 1 ;
+}
+
+static int do_list (uint32_t cc, unixmessage_t const *m)
+{
+  client_t *c = CLIENT(cc) ;
+  struct iovec v[1+numfds] ;
+  unixmessage_v_t ans = { .v = v, .vlen = 1+numfds, .fds = 0, .nfds = 0 } ;
+  struct iovec *vp = v + 1 ;
+  char pack[5] = "" ;
+  if (c->dumping || m->len || m->nfds) return (errno = EPROTO, 0) ;
+  if (!(c->flags & 4)) return answer(c, EPERM) ;
+  uint32_pack_big(pack + 1, (uint32_t)numfds) ;
+  v[0].iov_base = pack ; v[0].iov_len = 5 ;
+  genset_iter(fdstore, &fill_siovec_with_ids_iter, &vp) ;
+  if (!unixmessage_putv(&c->connection.out, &ans)) return answer(c, errno) ;
+  client_setdeadline(c) ;
+  return 1 ;
+}
+
+typedef struct getdumpiter_s getdumpiter_t, *getdumpiter_t_ref ;
+struct getdumpiter_s
+{
+  struct iovec *v ;
+  int *fd ;
+  char *limit ;
+} ;
+
+static int getdump_iter (char *thing, void *stuff)
+{
+  s6_fdholder_fd_t *p = (s6_fdholder_fd_t *)thing ;
+  getdumpiter_t *blah = stuff ;
+  unsigned char len = strlen(p->id) ;
+  tain_pack(blah->limit, &p->limit) ;
+  blah->limit[TAIN_PACK] = len ;
+  blah->v->iov_base = p->id ;
+  blah->v->iov_len = len + 1 ;
+  *blah->fd++ = p->fd ;
+  blah->v += 2 ;
+  blah->limit += TAIN_PACK + 1 ;
+  return 1 ;
+}
+
+static int do_getdump (uint32_t cc, unixmessage_t const *m)
+{
+  uint32_t n = numfds ? 1 + ((numfds-1) / UNIXMESSAGE_MAXFDS) : 0 ;
+  client_t *c = CLIENT(cc) ;
+  if (c->dumping || m->len || m->nfds) return (errno = EPROTO, 0) ;
+  if (!(c->flags & 1)) return answer(c, EPERM) ;
+  {
+    char pack[9] = "" ;
+    unixmessage_t ans = { .s = pack, .len = 9, .fds = 0, .nfds = 0 } ;
+    uint32_pack_big(pack+1, n) ;
+    uint32_pack_big(pack+5, numfds) ;
+    if (!unixmessage_put(&c->connection.out, &ans)) return answer(c, errno) ;
+  }
+  if (n)
+  {
+    uint32_t i = 0 ;
+    unixmessage_v_t ans[n] ;
+    struct iovec v[numfds << 1] ;
+    int fds[numfds] ;
+    char limits[(TAIN_PACK+1) * numfds] ;
+    for (; i < numfds ; i++)
+    {
+      v[i<<1].iov_base = limits + i * (TAIN_PACK+1) ;
+      v[i<<1].iov_len = TAIN_PACK+1 ;
+    }
+    {
+      getdumpiter_t state = { .v = v+1, .fd = fds, .limit = limits } ;
+      genset_iter(fdstore, &getdump_iter, &state) ;
+    }
+    for (i = 0 ; i < n-1 ; i++)
+    {
+      ans[i].v = v + (i<<1) * UNIXMESSAGE_MAXFDS ;
+      ans[i].vlen = UNIXMESSAGE_MAXFDS << 1 ;
+      ans[i].fds = fds + i * UNIXMESSAGE_MAXFDS ;
+      ans[i].nfds = UNIXMESSAGE_MAXFDS ;
+    }
+    ans[n-1].v = v + ((n-1)<<1) * UNIXMESSAGE_MAXFDS ;
+    ans[n-1].vlen = (1 + (numfds-1) % UNIXMESSAGE_MAXFDS) << 1 ;
+    ans[n-1].fds = fds + (n-1) * UNIXMESSAGE_MAXFDS ;
+    ans[n-1].nfds = 1 + (numfds - 1) % UNIXMESSAGE_MAXFDS ;
+    for (i = 0 ; i < n ; i++)
+    {
+      if (!unixmessage_putv(&c->connection.out, ans + i))
+      {
+        int e = errno ;
+        ++i ;
+        while (i--) unixmessage_unput(&c->connection.out) ;
+        return answer(c, e) ;
+      }
+    }
+  }
+  client_setdeadline(c) ;
+  return 1 ;
+}
+
+static int do_setdump (uint32_t cc, unixmessage_t const *m)
+{
+  char pack[5] = "" ;
+  uint32_t n ;
+  unixmessage_t ans = { .s = pack, .len = 5, .fds = 0, .nfds = 0 } ;
+  client_t *c = CLIENT(cc) ;
+  if (c->dumping || m->len != 4 || m->nfds) return (errno = EPROTO, 0) ;
+  if (!(c->flags & 2)) return answer(c, EPERM) ;
+  uint32_unpack_big(m->s, &n) ;
+  if (n > maxfds || n + numfds > maxfds) return answer(c, ENFILE) ;
+  c->dumping = n ;
+  n = n ? 1 + (n-1) / UNIXMESSAGE_MAXFDS : 0 ;
+  uint32_pack_big(pack+1, n) ;
+  if (!unixmessage_put(&c->connection.out, &ans)) return answer(c, errno) ;
+  return 1 ;
+}
+
+static int do_setdump_data (uint32_t cc, unixmessage_t const *m)
+{
+  client_t *c = CLIENT(cc) ;
+  if (!m->nfds || m->nfds > c->dumping || m->len < m->nfds * (TAIN_PACK + 3))
+    return (errno = EPROTO, 0) ;
+  if (!(c->flags & 2))
+  {
+    unixmessage_drop(m) ;
+    return answer(c, EPERM) ;
+  }
+  if (numfds + m->nfds > maxfds)
+  {
+    unixmessage_drop(m) ;
+    return answer(c, ENFILE) ;
+  }
+  {
+    char const *s = m->s ;
+    size_t len = m->len ;
+    uint32_t i = 0 ;
+    uint32_t indices[m->nfds] ;
+    for (; i < m->nfds ; i++)
+    {
+      s6_fdholder_fd_t *p ;
+      uint32_t oldid, idlen ;
+      if (len < TAIN_PACK + 3) break ;
+      idlen = (unsigned char)s[TAIN_PACK] ;
+      if (idlen > S6_FDHOLDER_ID_SIZE || len < TAIN_PACK + 2 + idlen || s[TAIN_PACK + 1 + idlen]) break ;
+      indices[i] = genset_new(fdstore) ;
+      p = FD(indices[i]) ;
+      tain_unpack(s, &p->limit) ;
+      memcpy(p->id, s + TAIN_PACK + 1, idlen+1) ;
+      p->fd = m->fds[i] ;
+      if (avltreen_search(fds_by_id, p->id, &oldid)) fds_close_and_delete(oldid) ;
+      avltreen_insert(fds_by_id, indices[i]) ;
+      avltreen_insert(fds_by_deadline, indices[i]) ;
+      s += TAIN_PACK + 2 + idlen ; len -= TAIN_PACK + 2 + idlen ;
+    }
+    if (i < m->nfds || len)
+    {
+      while (i--) fds_delete(indices[i]) ;
+      return (errno = EPROTO, 0) ;
+    }
+  }
+  c->dumping -= m->nfds ;
+  return answer(c, c->dumping ? EAGAIN : 0) ;
+}
+
+static int do_error (uint32_t cc, unixmessage_t const *m)
+{
+  (void)cc ;
+  (void)m ;
+  return (errno = EPROTO, 0) ;
+}
+
+typedef int parsefunc_t (uint32_t, unixmessage_t const *) ;
+typedef parsefunc_t *parsefunc_t_ref ;
+
+static inline int parse_protocol (unixmessage_t const *m, void *p)
+{
+  static parsefunc_t_ref const f[8] =
+  {
+    &do_store,
+    &do_delete,
+    &do_retrieve,
+    &do_list,
+    &do_getdump,
+    &do_setdump,
+    &do_setdump_data,
+    &do_error
+  } ;
+  unixmessage_t mcopy = { .s = m->s + 1, .len = m->len - 1, .fds = m->fds, .nfds = m->nfds } ;
+  if (!m->len)
+  {
+    unixmessage_drop(m) ;
+    return (errno = EPROTO, 0) ;
+  }
+  if (!(*f[byte_chr("SDRL?!.", 7, m->s[0])])(*(uint32_t *)p, &mcopy))
+  {
+    unixmessage_drop(m) ;
+    return 0 ;
+  }
+  return 1 ;
+}
+
+static inline int client_read (uint32_t cc, iopause_fd const *x)
+{
+  client_t *c = CLIENT(cc) ;
+  return !unixmessage_receiver_isempty(&c->connection.in) || (c->xindex && (x[c->xindex].revents & IOPAUSE_READ)) ?
+    unixmessage_handle(&c->connection.in, &parse_protocol, &cc) > 0 : 1 ;
+}
+
+
+ /* Environment on new connections */
+
+static int makere (regex_t *re, char const *s, char const *var)
+{
+  size_t varlen = strlen(var) ;
+  if (str_start(s, var) && (s[varlen] == '='))
+  {
+    int r = skalibs_regcomp(re, s + varlen + 1, REG_EXTENDED | REG_NOSUB) ;
+    if (r)
+    {
+      if (verbosity)
+      {
+        char buf[256] ;
+        regerror(r, re, buf, 256) ;
+        strerr_warnw6x("invalid ", var, " value: ", s + varlen + 1, ": ", buf) ;
+      }
+      return -1 ;
+    }
+    else return 1 ;
+  }
+  return 0 ;
+}
+
+static void defaultre (regex_t *re)
+{
+  int r = skalibs_regcomp(re, ".^", REG_EXTENDED | REG_NOSUB) ;
+  if (r)
+  {
+    char buf[256] ;
+    regerror(r, re, buf, 256) ;
+    strerr_diefu2x(100, "compile .^ into a regular expression: ", buf) ;
+  }
+}
+
+static inline int parse_env (char const *const *envp, regex_t *rre, regex_t *wre, unsigned int *flags, unsigned int *donep)
+{
+  unsigned int done = 0 ;
+  unsigned int fl = 0 ;
+  for (; *envp ; envp++)
+  {
+    if (str_start(*envp, "S6_FDHOLDER_GETDUMP=")) fl |= 1 ;
+    if (str_start(*envp, "S6_FDHOLDER_SETDUMP=")) fl |= 2 ;
+    if (str_start(*envp, "S6_FDHOLDER_LIST=")) fl |= 4 ;
+    if (!(done & 1))
+    {
+      int r = makere(rre, *envp, "S6_FDHOLDER_RETRIEVE_REGEX") ;
+      if (r < 0)
+      {
+        if (done & 2) regfree(wre) ;
+        return 0 ;
+      }
+      else if (r) done |= 1 ;
+    }
+    if (!(done & 2))
+    {
+      int r = makere(wre, *envp, "S6_FDHOLDER_STORE_REGEX") ;
+      if (r < 0)
+      {
+        if (done & 1) regfree(rre) ;
+        return 0 ;
+      }
+      else if (r) done |= 2 ;
+    }
+  }
+  *flags = fl ;
+  *donep = done ;
+  return 1 ;
+}
+
+static inline int new_connection (int fd, regex_t *rre, regex_t *wre, unsigned int *flags)
+{
+  s6_accessrules_params_t params = S6_ACCESSRULES_PARAMS_ZERO ;
+  s6_accessrules_result_t result = S6_ACCESSRULES_ERROR ;
+  uid_t uid ;
+  gid_t gid ;
+  unsigned int done = 0 ;
+
+  if (getpeereid(fd, &uid, &gid) < 0)
+  {
+    if (verbosity) strerr_warnwu1sys("getpeereid") ;
+    return 0 ;
+  }
+
+  switch (rulestype)
+  {
+    case 1 :
+      result = s6_accessrules_uidgid_fs(uid, gid, rules, &params) ; break ;
+    case 2 :
+      result = s6_accessrules_uidgid_cdb(uid, gid, &cdbmap, &params) ; break ;
+    default : break ;
+  }
+  if (result != S6_ACCESSRULES_ALLOW)
+  {
+    if (verbosity && (result == S6_ACCESSRULES_ERROR))
+       strerr_warnw1sys("error while checking rules") ;
+    return 0 ;
+  }
+  if (params.exec.len && verbosity)
+  {
+    char fmtuid[UID_FMT] ;
+    char fmtgid[GID_FMT] ;
+    fmtuid[uid_fmt(fmtuid, uid)] = 0 ;
+    fmtgid[gid_fmt(fmtgid, gid)] = 0 ;
+    strerr_warnw4x("unused exec string in rules for uid ", fmtuid, " gid ", fmtgid) ;
+  }
+  if (params.env.s)
+  {
+    size_t n = byte_count(params.env.s, params.env.len, '\0') ;
+    char const *envp[n+1] ;
+    if (!env_make(envp, n, params.env.s, params.env.len))
+    {
+      if (verbosity) strerr_warnwu1sys("env_make") ;
+      s6_accessrules_params_free(&params) ;
+      return 0 ;
+    }
+    envp[n] = 0 ;
+    if (!parse_env(envp, rre, wre, flags, &done))
+    {
+      if (verbosity) strerr_warnwu1sys("parse_env") ;
+      s6_accessrules_params_free(&params) ;
+      return 0 ;
+    }
+  }
+  s6_accessrules_params_free(&params) ;
+  if (!(done & 1)) defaultre(rre) ;
+  if (!(done & 2)) defaultre(wre) ;
+  return 1 ;
+}
+
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  int spfd ;
+  int flag1 = 0 ;
+  uint32_t maxconn = 4 ;
+  char const *compiled = S6RC_COMPILED_DEFAULT ;
+  char const *prefix = "" ;
+  PROG = "s6-rcd" ;
+
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    unsigned int t = 0, T = 0 ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "v:1C:i:x:t:T:c:l:s:p:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
+        case '1' : flag1 = 1 ; break ;
+        case 'i' : rules = l.arg ; rulestype = 1 ; break ;
+        case 'x' : rules = l.arg ; rulestype = 2 ; break ;
+        case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
+        case 'T' : if (!uint0_scan(l.arg, &T)) dieusage() ; break ;
+        case 'C' : if (!uint0_scan(l.arg, &maxconn)) dieusage() ; break ;
+        case 'c' : compiled = l.arg ; break ;
+        case 'l' : livedir = l.arg ; break ;
+        case 's' : scandir = l.arg ; break ;
+        case 'p' : prefix = l.arg ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+    if (t) tain_from_millisecs(&answertto, t) ;
+    if (T) tain_from_millisecs(&lameduckdeadline, T) ;
+  }
+
+  if (maxconn > S6RC_MAXCONN) maxconn = S6RC_MAXCONN ;
+  if (!maxconn) maxconn = 1 ;
+  if (livedir[0] != '/')
+    strerr_dief2x(100, livedir, " is not an absolute path") ;
+  if (scandir[0] != '/')
+    strerr_dief2x(100, scandir, " is not an absolute path") ;
+  if (strchr(prefix, '/') || strchr(prefix, '\n'))
+    strerr_dief1x(100, "prefix cannot contain a / or a newline") ;
+  if (flag1)
+  {
+    if (fcntl(1, F_GETFD) < 0)
+      strerr_dief1sys(100, "called with option -1 but stdout said") ;
+  }
+  else close(1) ;
+
+  spfd = selfpipe_init() ;
+  if (spfd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
+  if (sig_ignore(SIGPIPE) < 0) strerr_diefu1sys(111, "ignore SIGPIPE") ;
+  {
+    sigset_t set ;
+    sigemptyset(&set) ;
+    sigaddset(&set, SIGTERM) ;
+    sigaddset(&set, SIGHUP) ;
+    if (selfpipe_trapset(&set) < 0) strerr_diefu1sys(111, "trap signals") ;
+  }
+
+  if (rulestype == 2)
+  {
+    cdbfd = open_readb(rules) ;
+    if (cdbfd < 0) strerr_diefu3sys(111, "open ", rules, " for reading") ;
+    if (cdb_init(&cdbmap, cdbfd) < 0)
+      strerr_diefu2sys(111, "cdb_init ", rules) ;
+  }
+
+  {
+     /* Hello, stack. I have a present for you. */
+    genset clientinfo, fdinfo ;
+    avltreen fdidinfo, fddeadlineinfo ;
+    iopause_fd x[2 + maxconn] ;
+    client_t clientstorage[1+maxconn] ;
+    uint32_t clientfreelist[1+maxconn] ;
+    s6_fdholder_fd_t fdstorage[maxfds] ;
+    uint32_t fdfreelist[maxfds] ;
+    avlnode fdidstorage[maxfds] ;
+    uint32_t fdidfreelist[maxfds] ;
+    avlnode fddeadlinestorage[maxfds] ;
+    uint32_t fddeadlinefreelist[maxfds] ;
+     /* Hope you enjoyed it! Have a nice day! */
+
+    GENSET_init(&clientinfo, client_t, clientstorage, clientfreelist, 1+maxconn) ;
+    clients = &clientinfo ;
+    sentinel = genset_new(clients) ;
+    clientstorage[sentinel].next = sentinel ;
+    GENSET_init(&fdinfo, s6_fdholder_fd_t, fdstorage, fdfreelist, maxfds) ;
+    fdstore = &fdinfo ;
+    avltreen_init(&fdidinfo, fdidstorage, fdidfreelist, maxfds, &fds_id_dtok, &fds_id_cmp, 0) ;
+    fds_by_id = &fdidinfo ;
+    avltreen_init(&fddeadlineinfo, fddeadlinestorage, fddeadlinefreelist, maxfds, &fds_deadline_dtok, &fds_deadline_cmp, 0) ;
+    fds_by_deadline = &fddeadlineinfo ;
+
+    x[0].fd = spfd ; x[0].events = IOPAUSE_READ ;
+    x[1].fd = 0 ;
+      
+    if (flag1)
+    {
+      fd_write(1, "\n", 1) ;
+      fd_close(1) ;
+    }
+
+    /* We are long-lived and have to check absolute fd deadlines,
+       so we purposefully remain in wallclock mode. */
+    tain_now_g() ;
+
+    for (;;)
+    {
+      tain_t deadline ;
+      uint32_t j = 2 ;
+      uint32_t i ;
+      int r = 1 ;
+
+      if (cont) tain_add_g(&deadline, &tain_infinite_relative) ;
+      else deadline = lameduckdeadline ;
+      if (avltreen_min(fds_by_deadline, &i) && tain_less(&FD(i)->limit, &deadline)) deadline = FD(i)->limit ;
+      x[1].events = (cont && (numconn < maxconn)) ? IOPAUSE_READ : 0 ;
+      for (i = clientstorage[sentinel].next ; i != sentinel ; i = clientstorage[i].next)
+        if (client_prepare_iopause(i, &deadline, x, &j)) r = 0 ;
+      if (!cont && r) break ;
+
+      r = iopause_g(x, j, &deadline) ;
+      if (r < 0) strerr_diefu1sys(111, "iopause") ;
+
+      if (!r)
+      {
+        if (!cont && !tain_future(&lameduckdeadline)) break ;
+        for (;;)
+        {
+          if (!avltreen_min(fds_by_deadline, &i)) break ;
+          if (tain_future(&FD(i)->limit)) break ;
+          fds_close_and_delete(i) ;
+        }
+        for (j = sentinel, i = clientstorage[sentinel].next ; i != sentinel ; j = i, i = clientstorage[i].next)
+          if (!tain_future(&clientstorage[i].deadline)) removeclient(&i, j) ;
+        continue ;
+      }
+
+      if (x[0].revents & IOPAUSE_READ) handle_signals() ;
+
+      for (j = sentinel, i = clientstorage[sentinel].next ; i != sentinel ; j = i, i = clientstorage[i].next)
+        if (!client_flush(i, x)) removeclient(&i, j) ;
+
+      for (j = sentinel, i = clientstorage[sentinel].next ; i != sentinel ; j = i, i = clientstorage[i].next)
+        if (!client_read(i, x)) removeclient(&i, j) ;
+
+      if (x[1].revents & IOPAUSE_READ)
+      {
+        regex_t rre, wre ;
+        unsigned int flags = 0 ;
+        int dummy ;
+        int fd = ipc_accept_nb(x[1].fd, 0, 0, &dummy) ;
+        if (fd < 0)
+          if (!error_isagain(errno)) strerr_diefu1sys(111, "accept") ;
+          else continue ;
+        else if (!new_connection(fd, &rre, &wre, &flags)) fd_close(fd) ;
+        else client_add(&i, fd, &rre, &wre, flags) ;
+      }
+    }
+    return ((!!numfds) | (!!numconn << 1)) ;
+  }
+}
diff --git a/src/libs6rc/deps-lib/s6rc b/src/serverlib/deps-lib/s6rc
index 52c220f..52c220f 100644
--- a/src/libs6rc/deps-lib/s6rc
+++ b/src/serverlib/deps-lib/s6rc
diff --git a/src/libs6rc/s6rc-servicedir-internal.h b/src/serverlib/s6rc-servicedir-internal.h
index a4af0b9..a4af0b9 100644
--- a/src/libs6rc/s6rc-servicedir-internal.h
+++ b/src/serverlib/s6rc-servicedir-internal.h
diff --git a/src/libs6rc/s6rc_db_check_depcycles.c b/src/serverlib/s6rc_db_check_depcycles.c
index 5f8339e..5f8339e 100644
--- a/src/libs6rc/s6rc_db_check_depcycles.c
+++ b/src/serverlib/s6rc_db_check_depcycles.c
diff --git a/src/libs6rc/s6rc_db_check_pipelines.c b/src/serverlib/s6rc_db_check_pipelines.c
index 68121e2..68121e2 100644
--- a/src/libs6rc/s6rc_db_check_pipelines.c
+++ b/src/serverlib/s6rc_db_check_pipelines.c
diff --git a/src/libs6rc/s6rc_db_check_revdeps.c b/src/serverlib/s6rc_db_check_revdeps.c
index 0097d06..0097d06 100644
--- a/src/libs6rc/s6rc_db_check_revdeps.c
+++ b/src/serverlib/s6rc_db_check_revdeps.c
diff --git a/src/libs6rc/s6rc_db_read.c b/src/serverlib/s6rc_db_read.c
index 3991b4f..3991b4f 100644
--- a/src/libs6rc/s6rc_db_read.c
+++ b/src/serverlib/s6rc_db_read.c
diff --git a/src/libs6rc/s6rc_db_read_sizes.c b/src/serverlib/s6rc_db_read_sizes.c
index 433af2e..433af2e 100644
--- a/src/libs6rc/s6rc_db_read_sizes.c
+++ b/src/serverlib/s6rc_db_read_sizes.c
diff --git a/src/libs6rc/s6rc_db_read_uint32.c b/src/serverlib/s6rc_db_read_uint32.c
index b26bf46..b26bf46 100644
--- a/src/libs6rc/s6rc_db_read_uint32.c
+++ b/src/serverlib/s6rc_db_read_uint32.c
diff --git a/src/libs6rc/s6rc_graph_closure.c b/src/serverlib/s6rc_graph_closure.c
index 7c3a8f9..7c3a8f9 100644
--- a/src/libs6rc/s6rc_graph_closure.c
+++ b/src/serverlib/s6rc_graph_closure.c
diff --git a/src/libs6rc/s6rc_livedir_create.c b/src/serverlib/s6rc_livedir_create.c
index fd23a07..fd23a07 100644
--- a/src/libs6rc/s6rc_livedir_create.c
+++ b/src/serverlib/s6rc_livedir_create.c
diff --git a/src/libs6rc/s6rc_livedir_prefix.c b/src/serverlib/s6rc_livedir_prefix.c
index 09fe263..09fe263 100644
--- a/src/libs6rc/s6rc_livedir_prefix.c
+++ b/src/serverlib/s6rc_livedir_prefix.c
diff --git a/src/libs6rc/s6rc_livedir_prefixsize.c b/src/serverlib/s6rc_livedir_prefixsize.c
index d897fe6..d897fe6 100644
--- a/src/libs6rc/s6rc_livedir_prefixsize.c
+++ b/src/serverlib/s6rc_livedir_prefixsize.c
diff --git a/src/libs6rc/s6rc_lock.c b/src/serverlib/s6rc_lock.c
index d3ae2b5..d3ae2b5 100644
--- a/src/libs6rc/s6rc_lock.c
+++ b/src/serverlib/s6rc_lock.c
diff --git a/src/libs6rc/s6rc_read_uint.c b/src/serverlib/s6rc_read_uint.c
index 1f148ac..1f148ac 100644
--- a/src/libs6rc/s6rc_read_uint.c
+++ b/src/serverlib/s6rc_read_uint.c
diff --git a/src/libs6rc/s6rc_sanitize_dir.c b/src/serverlib/s6rc_sanitize_dir.c
index 9f647a9..9f647a9 100644
--- a/src/libs6rc/s6rc_sanitize_dir.c
+++ b/src/serverlib/s6rc_sanitize_dir.c
diff --git a/src/libs6rc/s6rc_servicedir_block.c b/src/serverlib/s6rc_servicedir_block.c
index bfa6440..bfa6440 100644
--- a/src/libs6rc/s6rc_servicedir_block.c
+++ b/src/serverlib/s6rc_servicedir_block.c
diff --git a/src/libs6rc/s6rc_servicedir_copy_offline.c b/src/serverlib/s6rc_servicedir_copy_offline.c
index 6581a4f..6581a4f 100644
--- a/src/libs6rc/s6rc_servicedir_copy_offline.c
+++ b/src/serverlib/s6rc_servicedir_copy_offline.c
diff --git a/src/libs6rc/s6rc_servicedir_copy_online.c b/src/serverlib/s6rc_servicedir_copy_online.c
index e676d5a..e676d5a 100644
--- a/src/libs6rc/s6rc_servicedir_copy_online.c
+++ b/src/serverlib/s6rc_servicedir_copy_online.c
diff --git a/src/libs6rc/s6rc_servicedir_internal.c b/src/serverlib/s6rc_servicedir_internal.c
index b70061f..b70061f 100644
--- a/src/libs6rc/s6rc_servicedir_internal.c
+++ b/src/serverlib/s6rc_servicedir_internal.c
diff --git a/src/libs6rc/s6rc_servicedir_manage.c b/src/serverlib/s6rc_servicedir_manage.c
index 5449f35..5449f35 100644
--- a/src/libs6rc/s6rc_servicedir_manage.c
+++ b/src/serverlib/s6rc_servicedir_manage.c
diff --git a/src/libs6rc/s6rc_servicedir_unblock.c b/src/serverlib/s6rc_servicedir_unblock.c
index 2a10bfd..2a10bfd 100644
--- a/src/libs6rc/s6rc_servicedir_unblock.c
+++ b/src/serverlib/s6rc_servicedir_unblock.c
diff --git a/src/libs6rc/s6rc_servicedir_unsupervise.c b/src/serverlib/s6rc_servicedir_unsupervise.c
index 2d15a70..2d15a70 100644
--- a/src/libs6rc/s6rc_servicedir_unsupervise.c
+++ b/src/serverlib/s6rc_servicedir_unsupervise.c